InspectEquip

InspectEquip attaches a panel to the inspect window that shows a list of the character's equipment sorted by source (i.e. Raid: Dragon Soul, Vendor, Crafted...). This gives you a quick overview of a character's equipment.

All raid items with detailed boss information, including Mists of Pandaria raids

Dungeon drops for all instances

Quest rewards for dungeon/raid quests, including legendary items

Justice/Valor Point items

Honor/Conquest Point items

Reputation items sold by faction vendors

Crafted items

Darkmoon Faire items, including the cards and the new rewards

The Kirin Tor rings sold in Dalaran

World Event items

The Argent Tournament rewards

Guild Vendor items

InspectEquip also works with Examiner and includes support for cached Examiner characters.

Please report bugs and missing items in the ticket system or leave a comment on this page.
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WoW 6.x/Warlords of Draenor support:

The latest version of this addon is compatible with WoW 6.0.
Please note that the dungeon and raid drops are updated automatically via the Encounter Journal (i.e. they should be available immediately when a new WoW patch is released). Other data, such as vendor or crafted items, still require an addon update.

@Kelem: It should add source information to tooltips on itemlinks too. Can you give me some more information about where it doesn't work? I just pasted an itemlink from AtlasLoot into guild chat and /w, and InspectEquip adds drop information to both tooltips. Could be a conflict with another addon. Are you using any chat addons or addons that auto-show tooltips on hover etc? I've tested it with Prat 3.0 and WIM and I'd love to make it compatible with other addons if that's the cause of the problem.

I haven't been in the TotC5 instance for a while,but as far as i remember the loot isnt assigned to chests&bosses but rather the whole instance.
Wowhead at least as dropsource available, maybe you could check that again

I have checked various websites and comments, and have found all variations such as T9.0/T9.25/T9.5, T9.0/T9.5/T9.5+, T9.232/T9.245/T9.258, so I don't really know what to use.
In the latest version they are now categorized as follows:

ilvl 232: Emblem of Triumph reward (T9)

ilvl 245: Trial of the Crusader-25 (T9)

ilvl 258: Trial of the Crusader-25 (Heroic) (T9)

However, I'm not sure if the "Trophy of the Crusade" required for the ilvl 245 items only drops in the 25-man version. I suspect it also drops in the 10-man heroic version, but I couldn't find any confirmed information about that. But if that's the case naming the set "T9-25" would be misleading as well.
Also, I just discovered that Blizzard apparently doesn't have a standard naming scheme even for the T7 sets. On the US site they are named "Tier Seven Raid - 10" and "Tier Seven Raid - 25", on the European site "Tier Seven Raid" and "Tier Seven Point Five Raid"... I guess it'll be interesting what they decide to call the new sets (once 3.3 is live ;)).
I hope the current solution is ok for now, at least the sets are now differentiated by source.

and for alliance and horde different sets,you're right.
i think it is more obvious to have "T9-10" (232), "T9-25" (245), "T9-25 (Heroic)" (258) than name the sets all the same.
not everyone will notice the different itemlevels &stats :)

@yoshimo: That's right, they are not completely correctly classified. I will remove the ilvl 258 from the Emblem of Triumph category and add them as drops from the heroic 25-man version of the new raid. Maybe also the ilvl 245 sets, because they require a raid drop in addition to the emblems, but I'm not really happy with either classification.
About the set names: I would have labelled them T9.0/T9.5, but now there are 3 sets :( Maybe something like "T9-10" (232), "T9-25" (245), "T9-25 (Heroic)" (258)?